What is Quickbooks sync manager? Before we move on to how to fix this type of error let's look at its cause and why it happens. Quickbooks 2014 Sync Manager error. It mainly occurs due to network failure or malfunction during transferring the data. It occurs if the file is moved to another location or can't be read by a disk which causes the user to have access to files. This error occurs due to the deletion or corruption of program files in the sync manager itself.